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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdffc9154efd8e49fe12a197c19357af24c6af2eaa29eacb2d9cf92285e3fdbf' 
  AND token = 'IMGU7H0PlhzGSI8ErmZeG4s/4cpLpksyQwuRrf5l5Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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