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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b146567c1032c26bd8fb965d0136107ef574cef843f7ae2c7b045aced7fa0f52' 
  AND token = '1/CMbzfgcQqZWKL3/JzybuCzf1xgJyMPCl/ZafSaM3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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