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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b272b3aafe798ea0a2faa20efe819632f19edc5d0e76d686292ad32d7c9a1c9c' 
  AND token = 'pMMAE5wdUw2P9kPmjVYx+E+scPiCK4zH+wdLNkE78EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}