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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b2097bade6ba9b029ee7d4dbe11fea1de89aa290a48c27d58b05017f0cbb98' 
  AND token = 'pvvIjiwizmufI3CpspDaLcbxb+GFvnS1RZLbZheJCfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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