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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc0b66dd2a9884c5d26a0bedcc41708adb4056b517a9397649fb734f30b1fb2' 
  AND token = 'CC8hdPK9uM4jnTlkB3OC+7A6ieu96qMjRKZzI30Ek24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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