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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e53c95b615f0831bb24e8efe6eaac5d01bfe6c9431ad7f9f9eb89ed92ce2a31' 
  AND token = 'ZP2t/PlIihJZd94Zcw6AtLXZnLHufMpYYWkPcoy8zto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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