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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360b23e8f51a354ba492467ad2e2494ae8a0cd9858ce6330290d506df8d22715' 
  AND token = 'BT4E4U26jPn4vo1TU/JuSFZyxM2XPlP5CwGk3iHG7fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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