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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b8b2743c25b2a5901e2d30011bdedea92f265d002de1db0bf8a92a40f0befc' 
  AND token = '+h/+KkkBppEXQ/ooEYgxp3pT16PgtrPiJ6n6McimI1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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