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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0fdaaa29d0fb00bbee714f363a0e4f6a940cf564c7f30e38dfa231be2a88e6' 
  AND token = 'bmxQWjziLS6NUFaYSe80Btr1GRWhN/IbXGE7Okd653I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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