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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee9c99470f82a2d26004eac2015442ccddf5a457cd5fd12473a375c185f7299' 
  AND token = 'gQhbLA7/s11CqxC2oV4v2vYkqagJ1KSm8VFls5VAcc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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