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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4505ba931414add040882853ca05538a0057b91c537b646bf5d50f40ab5a40' 
  AND token = 'AhshEC2t2F3LyWiwNOc1XRhz8oewZInoNvq/renfXDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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