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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143d51e752e2d1dc30ce2b17c390ef593edd1fa53dc0bc826b51767473c60b5d' 
  AND token = '2e9jZfJH0W40jLnUZGGuOL+6T/jcl61+BL1oxVlkcc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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