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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c44fbe37f3418e3157b7fa8620bf4d867b8c0b636cd90e6bf2b5972680f147' 
  AND token = 'GiXITT6epEGlE5A1tqC7kTue86ggLhaXAI2e9/OjX2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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