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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7963325fa695dd76ac519c9e10cbd2746712aebc8123a11ba3e1ddb38525f277' 
  AND token = 'D8UMC+b179tKRTRaUfTBkXAFPAI+J5GvKssRZyzDmj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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