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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8960d345cbfc503db2738467187d5cf85e12ca4f34122b3b6afb14279a7f227f' 
  AND token = '0fyeMGjh427zOxxYFq9O98GNxTSEsi8bpZKpGG1u7SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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