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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c752f39ce644455645d2e28aed8a5500c5f9dd51a1e41d4a93e475ccdcd389c' 
  AND token = 'K6tqguo2uYiwSwBp78A8tsY6EE/P8SEt+w9t922F6KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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