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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5480f4e785058fbd40b9edc5eab7f84f032e6586d49b572ba1f0d235f0c49e76' 
  AND token = 'lNtpbTWbi+dPNjusdz/rtV5A76PdESZlA7vbQaIndVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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