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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952548474165f7e23f97e596dbd839f939ef61d9609299499e05c8fd0c2b8d18' 
  AND token = 'dOWMWUgleJPHI/GTzxtVA9pAzcpYMHAEvnel2EJIZ+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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