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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc896b7ab4e84e60d0a0f563020d7c68843319715e3b02a02087fcdd6d30750' 
  AND token = '+yfysU3UqunH0p0P5O8kXDI3zk8uePOGX6ZgAoEJ9+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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