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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3382e91b80625a5e0f2b8b40009b399b43ea960b9df9e231297a666057bb662' 
  AND token = 'oIlAZ4NyPPDz56POb6N6u1AO2rnR7hCIj2mwhP6jB9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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