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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843b3edbfab9731abd47f5d9ee6d68401db366859051f0e82459d9f3b1dc179b' 
  AND token = 'rFGf6zw69Zm1GKfNsV4Gg66v0DVN/gr62MCIJeHcK1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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