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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79970a0191754af4cd7c1c318ac37fa21d5bd011c1bda6999b61cfb3993b14c4' 
  AND token = 'h2cACdDxRazjy1FcNQo9ai35DffGk1NRPCdmfcRscSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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