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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7460ad45dc2f221e4a0f4254ac3de57ba9fc0d7cc3843247b54475651587084a' 
  AND token = 'd+heLUiCi2PzlCQ33WLKKNkh891xunSPk6Upr0pQqL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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