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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3d2b0215de2f2b7dbfa52302066a5aacd2b50cb7d5317e6026f2ae248d0d69' 
  AND token = '1UUODob+nWGPWj4AN5IpT1HPuHRKLBmQOhgPu0xDN2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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