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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df534dc6d3cd2273bfa8325cc11345692fb663b5d8f9401f639a75afa739850' 
  AND token = 'iwBMotWNGyJjCFWpYdnlEu8g+YeOJsdA09OSESHl2y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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