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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c739ce07939098ba8a8fc2c433c8c27613cd1e824febe744a33dd25d2f4311f9' 
  AND token = 'GoCPvwiMsjr+fZg2XJF3dN8SDnnP5DFXA8lkAzkaNT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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