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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a75935b26861d1d849b6a31bdbd276b53fb0aa24d788ff01275d7eac9bb1c5a' 
  AND token = '3wI315Ma85f55mDtBFSaQSQ2yku+8vK1bd5245R/gPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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