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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde87b1c8383ff6bbb0887dd0f696088931f2c81483ce44ce59f59300cd26454' 
  AND token = 'qmg+S+/bPF0OcEAlXr53GUu3AY1p4Owe/Aq8BKXUVCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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