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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3027a14ebf38a082d4652bf0f84a9cc4009b361f26307de053fc916a8b13c12a' 
  AND token = 'YuJq2IvtzygebnyUn7p36Y0UN+TJuLuwKMkVTJ3ptWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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