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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7383e876aea1980e4ee5993c87b151aa8a99da6e845bbd4914d668fac95899b4' 
  AND token = '9/hksFd4v9ZdPjdpvdOZvFvUYqxBpbLkn/geRYzRe+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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