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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5480b2a5ce2dd659698a5ad11c0d208ed27808b79160b21575ad38e0c146bc35' 
  AND token = 'FET7q7XEsEEZnat3LhvjkzqyZ+lcLmqBXcn/L6zXmS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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