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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb19e40b130fb5bdf097f88e9faa0fba8c0cb291167367bfe96404a6e0790c9a' 
  AND token = 'zFlg72Gg6epcGvBPSF4LWvnxz0NveTl0VpjOY1MYZA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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