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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9544ba8b486e678c91204dd916a0929b09981b37f8f2e1edb30549fd0911326' 
  AND token = 'Kn2naXpfbDgTr2hC2+Fx54GsWCFC5kFuPWepdGSJWiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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