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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d65014d9c9240d3c8eff2ac71cfe6b4562b2c56640a0439b437025ddbb7bc1' 
  AND token = 'oSjv8Sx2mEuKhFLwbiK3oWc4gZo3kQorUEJ95IjMAn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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