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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc9fbecdca3fcfd08e598b66d12a8cc1518ef10cb69ba22d05a97f9a1f0892f' 
  AND token = '6FhKPfd5HELB5KRmO3g+yzL9wFB6b5pcuwYpop2oRSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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