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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b373c74b9e7fbf1a71504699e088732005d12036b49cbc6703feb1f770daaa60' 
  AND token = 'dn8jSuk4V7DYNgFgLVT13EWl4WBSWkMRANkn42WSBoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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