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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4767d95e17f2777398174fd40fd9b57ae9de05d70aaa1c9ce9d81fe3a0160f60' 
  AND token = '7E8zdd9Y3tVXoCL0UJFcVzhB6ZphqqxjOOV6AmtfH2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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