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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d73086ae50c75824698c2cec8289f1848239b1ca2b18ffe09df458efe5eb3c2' 
  AND token = 'MXTRx2jYqsaaGtPLGlLL05pVdDrAu0Fi3IlzZlIU5Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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