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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511b0e70598964b8555d2a4b2a25ce7b0f5e326f667a854bb1bd510fa8a1d512' 
  AND token = '0GrW7mWixseIAVXAQSQOLosd6FqOtcENrCJI0Yp4V7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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