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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a498946cf2d0707390dd3942775f67897b9f87760e8ba69f37727a8cf37eca4c' 
  AND token = 'aNBrTz7xT1ndJsoLkDUy2UJOIwMDL1K5qaDsdJ7+yPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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