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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67eb650853c2e558dfa024e3ef05a060325864aadb215f27a3af5cd63ecacadd' 
  AND token = 'xKo6G1KYdHT0t5PN/3HH4DvUTTNasCXmI1PQ2AZoLFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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