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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7aca95d2c6a9a125859f1e148412c8236b926e3b085dfa7503ade54fdb9687a' 
  AND token = 'kaM/wgV+ktQuEKk5ni5ROk/UVXVYj87bHjEXuRg9MWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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