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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f775c0c3ae506660abe68dc56c7a7eb62a0288ef62cc5a73e04b4c66075eb710' 
  AND token = '7EdexiUYx7G5Vnz7TJR/HvhP4dHMMkhZPHbBTCWERpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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