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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fdf10d0c1658c3bb6e739e96f6f82b3bd809a39cdeffebe2232c12ba93c6be' 
  AND token = 'OQeTlb6+LRRpSf41bYesBRXymU9wR6mppOU1YVagQxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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