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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2729e03c0a30eb902be975ce0e381b743c2ffc80f131f543b36535309dfce11b' 
  AND token = 'VhoR7OVAshEk/0MSWU6is9igZ8mKEODSGwYF0Mc1Lu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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