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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb51a92348c3e410a3298b93288d5f8a8ecd795bf158a44cd5e292665031d7e' 
  AND token = 'Aj93gp5LBdv3S29pyOVgC3izX5YGBGMRpLlKY1BZ1sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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