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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff66e63fe0ed5040839d85e54637b3393c8c71b0ce278268e10c5fa2a3a6ed7' 
  AND token = 'oQriQhOaN7cNFNd5QAIfL5MlXduCKdbe2Z8XVPnt+No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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