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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b4057203f9ffbc087530ed044e01dc8b562b3351e595ec49de514820b28e39' 
  AND token = 'Msh3Ppc+TH4+15NcOO2SrkMCLz4w0/uis0VL6a5l6mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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