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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9774c9f9ec55478da0fa0bb0020885f0c651c27d18b39da0ae6a998cc2e815f' 
  AND token = 'W+k5GB1ZdHF00iYzQ21jEH+DYlzMjqrvdv7hFTIMMSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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