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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f263a3d0a9f9e9421cafa89590a0f431dbc1369f6a9a1c083f5a032f735e7e6' 
  AND token = '1fZzSLY25w7yXJujdeghiz1tv02BrbfJfZa7VFriR5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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