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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b01ebbb31bc926744716188ef86d4d6224ca2ead97d60c526b6dcf2ae38033' 
  AND token = 'ba1Zt0nXkK+w3RkF5+xzJGdJEkC1ORtCgQ+Nf8a0jjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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