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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6b4d0ed91dc9e5b79bf45c59e390e4eb2e3adcc3b0f82dccc4999ea0ba27e2' 
  AND token = '891uNqqMPX9JCxMa7zgtuPd0OTvYTwNzfjgu4NxDCxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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