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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0c0739d1c90a8434ef936014ea74ab8e41869a2c532451d49e07cd79541b5a' 
  AND token = '69EfzTEf0Y76M3Gd9lX5oWGhLNNhFHKfja+taLqXDro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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