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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcef232eca324dafa4229b7985e85a858b9a2dfbe08416639f3b6a9aef9df8a' 
  AND token = 'amnZyj9ECCPu1f9yiKcxkvC/CSsNvUJ/epXSSyERBWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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