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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4d8aad0d0d5b7cc86d3cd491443da672f262a5e890914de645ed40a7a8d562' 
  AND token = 'RlJRUmBUc2l9HsYgQaLJsgGrtwt+bnfDkegakVGroGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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