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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e341363f0ab074925864776c302b723ae5d8ce062c8829ad3322205f43842d58' 
  AND token = '9fjXZhQAWCe4jybdIbaciYbBRN2h1dlGdFL7T9rHbe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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