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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd76f5cd3251de6bba4c124031638e9cff58163e5df7611f9035d218cda6c24' 
  AND token = '5VUNfrHqybTy4UobMjFNmIJjy435H3J9YEqF4XL3yG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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