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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bc831c39114ba3e88865b2c0ae72584706bbacb523c5173d67ae501d037eed' 
  AND token = '7wUFWM3iT9pCcWAOjoI0d+NUAkA6zmaW5nfXA43Ffw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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